Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/24 of 21/80?"
2124 × 2180 is 147640.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/24×21/80 21/24×42/80 21/48×21/80 63/24×21/80 21/24×63/80 21/72×21/80
© everydaycalculation.com